This is the user manual for Volto, the Plone 6 frontend.
The Plone 5.2 documentation for Classic UI is well structured, and should be emulated as the model for the Volto User Manual.
Additional sources of content may be used to fill out the Volto User Manual. Note that the audience for these sources may be a Developer, not an Editor, and therefore might need to be retargeted.
Plone 6 Demo for screen shots and videos.